A REVISION OF THE PISAURIDAE OF THE UNITED STATES Ivf 
The genus Maypacius Simon is related but differs in having two 
teeth on the lower margin of the furrow of the chelicera, the area 
of the four median eyes longer than wide and the area of the four 
anterior eyes hardly wider than long. 
Type of the genus: Thomisus dubius Hentz. 
Maypacius Simon, Hist. Nat. Araignées, 1808, 2:288, 292 (ad part) 
Maypacius Banks, U. S. Nat. Mus. Bul. 72, 1910, p. 54 
Maypacius Petrunkevitch, Bul. Amer. Mus. Nat. Hist., 1911, 29:544 
Maypacius Comstock, The Spider Book, N. Y., 1912, p. 605 
Key to the Species of Thanatidius 
A Lateral lobes of epigynum broadly in contact on the middle line behind ; 
median lobe rectangular, deeply notched behind T. dubius (Hentz) 
AA Lateral lohes of epigynum narrowly in contact on middle line behind ; 
median lobe long and narrow T. tenuis (Hentz) 
Thanatidius dubius (Hentz) 
BostouneNatwidist,.1oA7 5 44oy pines ties) Tl 
Type: Thomisus? dubius Hentz; type specimen not known to exist 
Type locality: North Carolina . 
Female (alcohol) : length 9 mm; iegs 1-2-3-(4th missing), 22-21-16-(?) mm; 
pl. 1; pl. 33, fig. 2, epigynum. | | 
Cephalothorax above with a broad, median light brown band, 
clothed with short, light brown hair; the band incloses the eyes and 
extends entire length of cephalothorax; back of posterior eyes an 
oval area lighter, with a narrow, line like extension through the 
dorsal groove; sides of cephalothorax light yellowish white clothed 
with white hairs; extreme margin with a fringe of white; a pencil 
of long, white hairs extending forward between median eyes. Eyes 
equal in size or nearly so except posterior lateral which are slightly 
larger; triangle of four anterior eyes, wider in front than long; 
anterior lateral eyes separated by about twice the diameter of one 
of them and slightly farther apart than posterior median. Chelicera 
yellowish white spotted irregularly in front with black; lower margin 
of the furrow with three teeth. Abdomen above with a broad 
median band, dark brown, clothed with short, brown hairs and nar- 
rowly margined with white; a broad band yellowish white and bear- 
ing white hairs each side of median dark band; venter of abdomen 
with sides light brown; back of epigastric furrow dusky yellow with 
two dark lines extending from epigynum half way to spinnerets. 
Legs long, slender, light yellowish brown above, dusky beneath with 
small scattered spots of dark gray; coxae of third and fourth legs 
darker than those of first and second pairs; Sternwm dark gray 
with light yellow border and stripe through middle of anterior half. 
Epigynum (pl. 33, fig. 2) prominently raised on epigastrium, heavily 
chitinized; median lobe convex and notched behind, lateral lobes 
broadly in contact posteriorly. Male unknown. 
